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TO ALL WHVOM IT MAY (JONCERN: i

u Be it known that I, FRANCIS L. KING, of the city and county ofWorcester, and Commonwealth oi Massa chnsetts, have invented a new andimproved Machine for Dressing Stone; and I hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation ofthe saine, reference being had to the drawings annexed,which make a part of this specification- Fignre 1 being a side elevationof ainachine constructed after my invention.

Figure 2, an end elevation.

Figure 3, a section taken on the red line' A to B on tig. 2; and' Figure4, a detached perspective view of the collars L on an enlarged scale.

A variety of' stone-dressing and polishing machines have heretofore beeninvented' having different combinations of motion in the upper andncther stones, but few, if any, are found to produce uniformly perfectwork, owing to the veins or spots of different degrees ci' hardness inmost varieties of the material to be operated on.

The object of my invention, first, is to effect a more perfectcombination of motions so as to preventany renndness in the face of thefinished Work, as is almost certain to be the easlc'where the saidsurfaces have a reciprocating motion only; and it consists in combininga reciprocating bedi'or carrying the nether stone with one or morerotating vertical spindles for carrying the upper stones; also lin anovel construction of the.

bearings or `journals of said spindles, whereby they may have a'vertically sliding and at the same time a rotary motion, imparted to anordinary square iron bar; and further, in providing that the lowerjournal of said spindle shall at alltimes be immediately above thecarrying frames of the upper stones, whereby all lateral vibration Aandthe convex grinding consequent thereon are prevented.

By the rotary motion I obtain a Alever power, and thereby materiallydiminish the motivetpower required, while at the same time7 by mycombination ofthe two motions, Ivery materially increase the grindingcapacity. To reduce the stone to a flat surface I must remove the roughor superuous parts. This must be done`by removing small particles at atime. By this combination of motion I apply to each of these particles apower which draws it in every direction almost at the same instant, thusliterally twisting and rolling each particle from its position, and atthe same time the upper as well as the under stones are dressed for use.

To enable others skilled in the art to make`and use my invention., Iwill describe its consti-notion and operation by referring to thedrawings. I

The framing of my machine may be constructed in any convenient form andof suitable material, so arranged as to furnish journal bearing for theseveral operating parts. In a vertical position in the upper portion ofthis framing, in suitable bearings, is the main shaft T, carrying themaster-wheel V, which gears into wheels M M on the vertical shafts K IQwhich will be hereinafter more fully explained. Said master-wheel alsogives motion to the drum D through a pinion on the vertical shaft b andbelt c', or in any other convenient manner; or the train of motion maybe in the reverse direction, the drum D receiving its motion primarilyand communi-v cating motion to the shafts K by suitable intermediategearing. The shafts K are supported in bearings N in the horizontal barsR R and S. These bearings are recessed on their upper sides to receivethe collars L, and which rotate freely therein, said collars having anaperture corresponding with thc formation of the shafts K so that thelatter may slide therethrough vertically whilst the collars rotate intheir several bearings. Similar apertures are formed in the wheels INIM, so that the shafts K are free to'slide vertically without changingthe position of lthe gearing o1' jourualsin the framing-bars R R, whilstthe bar S is capable of rising or falling (with regard to the otherportion of the framework) so Aa's to maintain a position as near aspossiblel to and above the holders II, which carry the upper stones andthereby `prevent the vibration of the shaft K. The holders H areprovided with set-screws I or clamps, which serve to secure the upperstone in theV desired position. O represents a hopper to supply sand,and P atube to convey water to the surface of the material operated ontc facilitate the grinding or polishing in the usual manner. In practiceit might be found more convenient to arrange the gearing above the lowerbars lli/,and to elevate the hopper O and tube P above the upper barsIt.

The construction of the machine being thus described, its operation willbe as follows: A block or series of blocks, G, of regular thicknessbeing arranged von the carriage'O, and, if small, Vsecured togetherthereon by suitable clumps, and blceksF, secured by the setese'rews I inthe centre of the holders H, a reciprocating motion is communicated tothe carriage C, es before described, and e rotary motion `through thegear-Wheels M to the shafts K; thus a continuous rotary motion of theupper stone is produced in 'conta-ct with n reciprocating motion of thelower` stone, and u varying ongle of operntion on the projectingparticles ini-opid succession Soon reduces the surfaces in contact touperfect plane, the vertical motion ofthe shafts K through theirbearings and through the eyes of. the propelling-wheels M compensatingfor the reduction of the surface or for thicker er thinner blocks ofstone, whilst the sliding of the bars S keeps the lower bearing in closeproximity to the holders H and prevents any vibration of the shafts K,es before described.

What I claim as new, and desire to secure :by Letters Patent, is

l. The self-adjusting, spindles K and their holders H, for rotating theupper stone, in combination with the reciprocating bed C for carryingthe lower stone, when constructed, arranged, :ind operatingsubstantially as set forth. A i Y 2. The combination of the boxes N androtating collars L with the sliding spindles K, constructed andoperating essentially as and for the purpose specified. i

3. The self-adjusting frame S, carrying the lower journalbox N L, incombination with' the spindles'K and holders H, operating substantiallyasend for'the purpose described.

' FRANCIS L..KING.

Witnesses H. 0.31011, FRANK W. PERRY.

